Alternative current impedance spectroscopy (ACIS) is a promising non-destructive testing method to monitor long-term change and assess the durability of concrete. This study investigates influences Ethylene Diamine Tetraacetic Acid (EDTA) on hydration hardening cement by ACIS. It found that EDTA retards early-age but can facilitate later age reaction. Pastes with show comparable or higher compressive strength than Control at 28 d, especially when dosage 0.4%. Microstructural characterization...

Permafrost thawing is a common natural phenomenon in cold regions, where it has significant impacts on ecosystem stability and the sustainability of human society. This study elucidates melting process frozen soil importance water content during at pore scale based nuclear magnetic resonance (NMR) investigations. Additionally, thermodynamic theory applied to interpret link between ice NMR T2 relaxation signals. The signal intensity been used estimate degree soil, however, mechanism...

In this study, the adsorption behavior of CaAl-Cl layered double hydroxide (CaAl-Cl-LDH) with a controlled pH value (pH = 6) on Co(II) ions ([Co] 8 mM) is investigated. The comprehensively accepted mechanism cobalt LDH considered to be co-precipitation, and final adsorbed products are normally crystalline Co-LDH. One unanticipated finding that crystalline/amorphous blends found in X-ray diffraction (XRD) pattern Co-adsorbed LDH. To shed light mechanisms process an aqueous solution by...

People with suicidal ideation (PSI) are increasingly using social media to express feelings. Researchers have found that their internet-based communication may lead the spread of ideation, which presents a set challenges for suicide prevention. To develop effective prevention and intervention strategies can be efficiently applied in online communities, we need understand behavior PSI communities. However, date there been no studies specifically focus on Chinese A total 4489 postings users...

Abstract High shear wet granulation (HSWG) has been wildly used in manufacturing of oral solid dosage (OSD) forms, and process modeling is vital to understanding controlling this complex process. In paper, data fusion multivariate technique were applied develop a formulation-process-quality model for HSWG The experimental from both literature the authors’ laboratory fused into single formatted representation. A material database matching method compensate incomplete physical characterization...

Suicide is a leading cause of death in China, and so suicide intervention on social media an important issue the field public health. Sina Weibo (Weibo) emerging surveillance tool that may provide online assistance for users at risk suicide.Keyword-based methods supervised classifiers were employed to conduct this research. A control group was established explore differences between with suicidal ideation (USI) general population.A total 114 USI detected from 1 million active users. By...

Abstract High belite cement has a wide application potential due to its low energy consumption, CO 2 emission, and excellent durability performance. Due the hydration rate strength development at an early age, activation of beta-dicalcium silicate (β-C S) crystallographic structure is essential improve high cement. In this study, β-C S phase activated by dissolving Ba 2+ ions into crystal lattice rate. Unlike traditional analysis methods thermodynamics dynamics theory, first principle...

Purpose The purpose of this paper is to develop a coupled lattice Boltzmann model for the simulation freezing process in unsaturated porous media. Design/methodology/approach In developed model, structure with complexity and disorder was generated by using stochastic growth method, then Shan-Chen multiphase enthalpy-based phase change were introducing interface force describe variation interface. pore size media considered as an influential factor transition temperature, interfacial formed...

The supercritical carbon dioxide (sCO2) Brayton cycle is the preferred power for future nuclear energy, fossil solar and other energy systems. As regenerator in cycle, printed circuit heat exchanger (PCHE) exhibits a high transfer efficiency, compactness, robustness. structure design of its internal flow channel one most important factors to enhance reduce pressure loss. In present work, trapezoidal PCHE prototype designed manufactured, thermal-hydraulic performance as experimentally studied...

Different ratios of carbon nanofibers (CNF) and carboxyl functionalized multi-walled nanotubes (CMWCNT), dispersed by the polycarboxylate based superplasticizer, were added in this study to investigate mechanical damping behavior cement paste. The additions CNF CMWCNT simultaneously improved loss tangent, storage modulus paste different extents at 0.2 Hz frequency. exhibited higher with addition CNF. provided tangent but lower compared modified mechanisms for incorporated explained effective...

This experimental investigation focused on the mechanical and damping properties of raw alkali treated flax fibers reinforced cementitious composites. The objective this study was to research influence fiber for strengths were obtained using compressive flexural tests measured a dynamic analysis. Structural modifications analyzed scanning electronic microscopy mercury intrusion porosimetry. Results showed that cement strength decreased, increased by addition untreated fibers. Alkali...

In this letter, an integrated tower-type sensor (TTS) to be embedded in concrete system for permanent monitoring the service condition of reinforcing steel was developed, such as macro-cell current, cover-zone mortar resistance, open-circuit potential, and corrosion current density build-in electrodes. Sensors have been tested chloride-contaminated concrete, simulating a kind marine circumstance. By analyzing output, quantitative relationship among established.

The leaching behavior of hydraulic concrete can’t be neglected for its long-term exposure to surrounding water resulting in irreversible damage durability, such as strength loss and porosity increase. Given that the coupling effect freeze-thaw cycling on durability especially severe cold regions is a big challenge. For quite slow process natural leaching, electrochemical accelerated method (EALM) was proposed investigate evolution under two test schemes (scheme one only 50 days scheme first...

As the industrial robot manipulators are widely used in various fields, limitation of traditional closed architectures for control systems becomes increasingly evident. It is almost impossible to modify planning algorithms, model, or type servo amplifier block. In this paper, an open architecture system presented. allows users change hardware system, e.g. geometric parameters robots, number/type axes, and both motion interfacing software, e.g., modify/replace planning/control algorithms...